Numbers 6:18-19

18Then the Nazirite shall shave his consecrated head at the door of the tabernacle of meeting, and shall take the hair from his consecrated head and put it on the fire which is under the sacrifice of the peace offering.

19‘And the priest shall take the boiled shoulder of the ram, one unleavened cake from the basket, and one unleavened wafer, and put them upon the hands of the Nazirite after he has shaved his consecrated hair,